Charter was arrested in 2004 over the importation of pseudoephedrine from Malaysia. He pleaded guilty and was sentenced to four years' jail with a minimum of two.

Before his interview, Charter told reporters ASADA faced a difficult task finding out exactly what took place with the AFL club last season and he wanted to help.

"There's a lot of public misinformation out there and they're spending a lot of time putting out spotfires and dealing with things other than the actual investigation," Charter said.

"But most importantly key individuals that were required to give information to fill in the gaps have not fronted ASADA for whatever personal reasons and that provided really more questions than answers in relation to what was needed.

"I'm here today to try to fill in those answers for ASADA, along with physical evidence in relation to that process and at the same time deal with the issues that ASADA raise.

"This hopefully will expedite the process."

Charter said the physical evidence he would provide ASADA included text messages, voice messages and emails.

He said his relationship with Dank stretched back 18 months to two years, but Dank no longer talked with him.

"Stephen no longer engages or speaks to me ever since he engaged a barrister," Charter said.

"We have attempted to make communication but to no avail."

Dank has so far refused to be interviewed by ASADA, which he is not compelled to do as he no longer works for an AFL or NRL team.

Charter said he would eventually like to work with ASADA or the AFL to help in the fight against performance-enhancing drugs.

He said the current investigation was an important step.

"I think this is Australia's Lance Armstrong moment," he said.

"You really have to draw a line in the sand and decide whether we sweep it under the carpet or whether we move forward in a better manner."